基于紫外光谱法的纯棉织物中氯菊酯含量检测方法

Testing method for permethrin content in cotton fabrics based on use of ultraviolet spectroscopy

为寻求更高效地测试纺织品中氯菊酯含量的方法,利用驱蚊整理剂以及浸轧工艺制备了不同质量浓度氯菊酯整理的纯棉织物,采用扫描电子显微镜、带积分球的紫外可见分光光谱仪、常规气相色谱仪对其微观形貌、光谱特征及氯菊酯负载量进行分析对比,并进一步对比测试耗时、样品需求量以及测试成本等指标。结果表明:氯菊酯整理纯棉织物在280 nm处出现强吸收,对应氯菊酯分子的紫外特征吸收,且吸光度值与织物中的氯菊酯负载量成正比,同时与气相色谱测试的棉织物中氯菊酯含量具有较好的拟合关系。紫外光谱法与气相色谱法测试结果的相对误差率和变异值相当,但紫外光谱法具有测试效率高,成本低的明显优势。

To establish a more efficient method for detecting the content of permethrin in textiles,cotton fabrics containing different concentrations of permethrin were fabricated by padding process,and a comparative analysis of the permethrin-finished fabrics was presented in detail,using micromorphology,spectral characteristics and the loading of permethrin,scanning electron microscopy,ultraviolet-visible(UV-Vis)spectrometer with integrating sphere and the conventional gas chromatography.Further,the indices such as testing time,sample size and the testing cost were compared and evaluated.A strong absorption characteristic peak at 280 nm was observed,corresponings to the ultraviolet characteristic absorption of permethrin molecules.The value of absorbency is proportional to the loading of permethrin within the as-prepared fabric,which is consistent with the permethrin loading within the same fabric tested by using gas chromatography.The relative error and the value of variation detected by using UV-Vis spectroscopy are similar to the results achieved using gas chromatography.However,the UV-Vis spectroscopy testing method has obvious advantages of high efficiency and low cost.